Discrepancy in memory utilization value between PM and Spectrum for the same device

Products

• DX NetOps
• CA Spectrum
• CA Performance Management - Usage and Administration

Issue/Introduction

The Memory utilization for the Arista device displayed in Performance Management and Spectrum does not line up.

Spectrum displays the following for Memory utilization:

Performance Management Portal displays the following for Memory utilization:

Environment

DX NetOps: Any version

Cause

Spectrum and Performance Management display memory usage differently.

There are 4 instances of Memory.

• RAM (1)
• RAM (Buffers) (2)
• RAM (Cache) (3)
• RAM (Unavailable) (100)

Resolution

Spectrum displays memory usage individually (per instance).

Spectrum polls the Memory Utilization from the RFC-2790 (HOST-RESOURCE-MIB)

Memory utilization can be found in the NRM_DeviceMemoryUtilization (0x12ac6) table attribute of the device model:

Memory Usage (Instance ID=1):

32889564  100%
  7984676    x

x=24,28%  ~ 24%

 

Performance Management (PM) displays the aggregate average memory usage.

(0.89 + 10.24 + 24.28 + 15.68) / 4 = 12,76